I'll put a memo out to our project managers and superintendents if there is a nationally known safety awareness for the month/week/day. If weather conditions are at an extreme, I'll put out an OSHA Fact Sheet (or something of the like). For example: If it's going to be 112ºF outside, I'll distribute information on preventing heat-related injuries and illnesses. I also try to put out random friendly safety notes to keep people on their toes.
-Justin
Eat. Skate. Sleep. Repeat.